<?php

/**

 * @file

 * Default theme implementation to navigate books.

 *

 * Presented under nodes that are a part of book outlines.

 *

 * Available variables:

 * - $tree: The immediate children of the current node rendered as an unordered

 *   list.

 * - $current_depth: Depth of the current node within the book outline. Provided

 *   for context.

 * - $prev_url: URL to the previous node.

 * - $prev_title: Title of the previous node.

 * - $parent_url: URL to the parent node.

 * - $parent_title: Title of the parent node. Not printed by default. Provided

 *   as an option.

 * - $next_url: URL to the next node.

 * - $next_title: Title of the next node.

 * - $has_links: Flags TRUE whenever the previous, parent or next data has a

 *   value.

 * - $book_id: The book ID of the current outline being viewed. Same as the node

 *   ID containing the entire outline. Provided for context.

 * - $book_url: The book/node URL of the current outline being viewed. Provided

 *   as an option. Not used by default.

 * - $book_title: The book/node title of the current outline being viewed.

 *   Provided as an option. Not used by default.

 *

 * @see template_preprocess_book_navigation()

 *

 * @ingroup themeable

 */

?>

<?php if ($tree || $has_links): ?>

  <div id="book-navigation-<?php print $book_id; ?>" class="book-navigation">

    <?php print $tree; ?>

    <?php if ($has_links): ?>

    <div class="page-links clearfix">

      <?php if ($prev_url): ?>

        <a href="<?php print $prev_url; ?>" class="page-previous" title="<?php print t('Go to previous page'); ?>"><?php print t('‹ ') . $prev_title; ?></a>

      <?php endif; ?>

      <?php if ($parent_url): ?>

        <a href="<?php print $parent_url; ?>" class="page-up" title="<?php print t('Go to parent page'); ?>"><?php print t('up'); ?></a>

      <?php endif; ?>

      <?php if ($next_url): ?>

        <a href="<?php print $next_url; ?>" class="page-next" title="<?php print t('Go to next page'); ?>"><?php print $next_title . t(' ›'); ?></a>

      <?php endif; ?>

    </div>

    <?php endif; ?>

  </div>

<?php endif; ?>